A tip–gap mesh-like bilayer SERS substrate for highly sensitive detection

Liang Lv; Junrong Li; Wei Fang; Aiguo Shen; Jiming Hu

doi:10.1039/C8AY00530C

A tip–gap mesh-like bilayer SERS substrate for highly sensitive detection

Liang Lv,^a Junrong Li,^b Wei Fang,^a Aiguo Shen*^a and Jiming Hu^a

Author affiliations

* Corresponding authors

^a Key Laboratory of Analytical Chemistry for Biology and Medicine, Ministry of Education, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P. R. China
E-mail: agshen@whu.edu.cn

^b Centre for Personalized Nanomedicine, Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Australia

Abstract

Tips of noble metal nanostructures and the gaps between closely packed noble metal nanostructures are widely claimed as hot-spots for SERS sensing. A significant amount of effort and expertise has been devoted to the reformation and maximum utilization of the “tips” and “gaps”. However, most studies focus on the “tips” or the “gaps” separately. Here we report a novel SERS substrate that contains a particular mesh structure of curved-edge gold nanocubes (CENCs) and Au nanospheres (Au NSs), one of the tips of CENCs inserted into the gaps between three closely packed Au NSs. Meanwhile, a facile and time-saving novel protocol has been proposed to fabricate this mesh structure in the form of a bilayer SERS substrate. The as-fabricated substrate exhibited extraordinary SERS sensitivity for malachite green (MG) and melamine, which could be attributed to the tip–gap mesh structure. The detection limit is as low as 10⁻¹² M and 10⁻⁹ M, respectively.

Supplementary files

Publication details

The article was received on 12 Mar 2018, accepted on 05 Apr 2018 and first published on 05 Apr 2018

Article type: Paper

DOI: 10.1039/C8AY00530C

Citation: Anal. Methods, 2018,10, 2251-2256

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A tip–gap mesh-like bilayer SERS substrate for highly sensitive detection

L. Lv, J. Li, W. Fang, A. Shen and J. Hu, Anal. Methods, 2018, 10, 2251
DOI: 10.1039/C8AY00530C
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Analytical Methods

A tip–gap mesh-like bilayer SERS substrate for highly sensitive detection

Abstract

Supplementary files

Publication details

A tip–gap mesh-like bilayer SERS substrate for highly sensitive detection

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